An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The population of the Earth has more than doubled since 1950.
151
Jupiter is bigger than all the other planets combined.
254
The light hitting the earth right now is 30 thousand years old.
163
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221